https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112643
--- Comment #21 from Haochen Jiang <haochen.jiang at intel dot com> ---
(In reply to Andrew Pinski from comment #20)
> The use of __builtin_ia32_2intersectd128 in avx512vp2intersectvlintrin.h has:
> #pragma GCC target("avx512vp2intersect,avx512vl,no-evex512")
>
> While i386-builtin.def does:
> BDESC (0, OPTION_MASK_ISA2_AVX512VP2INTERSECT, CODE_FOR_nothing,
> "__builtin_ia32_2intersectd128", IX86_BUILTIN_2INTERSECTD128, UNKNOWN, (int)
> VOID_FTYPE_PUQI_PUQI_V4SI_V4SI)
This is a known issue I figured out yesterday but should not cause the problem
since it actually relaxed conditions. It will cause ICE when caliing builtins
directly.
The reason why I am not reproducing the regression seems mainly caused by the
machine I built with all have AVX512, but all the CPUs mentioned here did not,
which will lead to different behavior on march and option override.
Rebuilding on AVX only machine to reproduce.
